Perhaps you should try some spelling variations:
"50 ns_ decrease" » "50 _ decrease" (Expand Search), "50 use decreased" (Expand Search), "50 ash decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 nss_ decrease" (Expand Search), "50 ngs_ decrease" (Expand Search), "50 μs_ decrease" (Expand Search)
"50 nn decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 mean decrease" (Expand Search), "50 n_ decrease" (Expand Search), "50 na decrease" (Expand Search), "50 n_ decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "59 nn decrease" (Expand Search), "50 nsn decrease" (Expand Search), "50 ngn decrease" (Expand Search), "50 μn decrease" (Expand Search)
"50 n decrease" » "50 _ decrease" (Expand Search), "50 a decrease" (Expand Search), "50 _ decreased" (Expand Search), "50 ns decrease" (Expand Search), "50 ng decrease" (Expand Search), "50 μ decrease" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("50 nn decrease") OR ("50 ns_ decrease"))) OR ("50 n decrease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"50 nn decrease\") OR (\"50 ns_ decrease\"))) OR (\"50 n decrease\"))".
• Removing quotes may allow a broader search: (((( 50 nn decrease ) OR ( 50 ns_ decrease ))) OR ( 50 n decrease )).
• Adding a wildcard symbol may retrieve word variants: (((("50 nn decrease") OR ("50 ns_ decrease"))) OR ("50 n decrease"))*.